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EDTA distillation

Dowex 50 X 4, 100-200 mesh cation exchange resin was prepared by washing successively with concentrated HCl, distilled water, 0.1 m EDTA, distilled water, and 0.1 m NaOH. The Na" " form resin was loaded into a glass column (1.2 cm ID and 5.7 cm length) and equilibrated with acetate buffer of the desired pH prior to the experiment. Glass wool was placed on top of the... [Pg.520]

Treatment of in EDTA distilled aeetone with Cu " " (7.1 x M, 25 ) leads to eonsumption of the endoperoxide at a rate of... [Pg.98]

Water. Distilled water must be (a) redistilled in an all-Pyrex glass apparatus or (b) purified by passage through a column of cation exchange resin in the sodium form. For storage, polyethylene bottles are most satisfactory, particularly for very dilute (0.00 lAf) EDTA solutions. [Pg.1169]

Procedure. Select a volume of sample requiring less than 15 mL of titrant to keep the analysis time under 5 min and, if necessary, dilute the sample to 50 mL with distilled water. Adjust the pH by adding 1-2 mL of a pH 10 buffer containing a small amount of Mg +-EDTA. Add 1-2 drops of indicator, and titrate with a standard solution of EDTA until the red-to-blue end point is reached. [Pg.326]

Ammonium sulfate [7783-20-2] M 132.1, m 230 (dec), 280 (dec), d 1.77. Crystd twice from hot water containing 0.2% EDTA to remove metal ions, then finally from distilled water. Dried in a desiccator for 2 weeks over Mg(C104)2. After 3 recrystns ACS grade had Ti, K, Fe, Na at 11, 4.4, 4.4, 3.2 ppm resp. [Pg.395]

EDTA solution, 10 M. Dissolve 3.7225 g of analytical grade disodium salt in distilled water and dilute to 100 mL. [Pg.182]

Pipette 25.0 mL of the 0.01 M calcium ion solution into a 250mL conical flask, dilute it with about 25 mL of distilled water, add 2mL buffer, solution, 1 mL 0.1M Mg-EDTA, and 30-40mg solochrome black/potassium nitrate mixture. Titrate with the EDTA solution until the colour changes from wine red to clear blue. No tinge of reddish hue should remain at the equivalence point. Titrate slowly near the end point. [Pg.326]

Procedure. Dissolve a weighed amount of ferro-manganese (about 0.40 g) in concentrated nitric acid and then add concentrated hydrochloric acid (or use a mixture of the two concentrated acids) prolonged boiling may be necessary. Evaporate to a small volume on a water bath. Dilute with water and filter directly into a 100 mL graduated flask, wash with distilled water and finally dilute to the mark. Pipette 25.0 mL of the solution into a 500 mL conical flask, add 5 mL of 10 per cent aqueous hydroxylammonium chloride solution, 10 mL of 20 per cent aqueous triethanolamine solution, 10-35 mL of concentrated ammonia solution, about 100 mL of water, and 6 drops of thymolphthalexone indicator solution. Titrate with standard 0.05M EDTA until the colour changes from blue to colourless (or a very pale pink). [Pg.336]

Mercury-EDTA solution. Mix small equal volumes of 0.05M mercury(II) nitrate and 0.05 M EDTA neutralise the liberated acid by the addition of a few drops of 3M ammonia solution. (In acid solution an insoluble precipitate, probably HgH2Y, forms after a few days.) Dilute 10.0 mL of this solution to 100 mL with distilled water. The resulting ca 0.0025 M mercury-EDTA solution is used for most titrations. [Pg.587]

Fig. 4.1.5 The time course of aequorin luminescence measured with various concentrations of Ca2+. Calcium acetate solution (5 ml) was added to 10 pi of aequorin solution to give the final Ca2+ concentrations of 10 2 M (A), 10-4 M (B), 10-5 M (C), 10 6 M (D), and 10 7 M (E) at 25°C. The dashed line (F) represents the light emitted following the addition of deionized distilled water that had been redistilled in quartz. The concentration of EDTA derived from the aequorin sample was 10 7 M (final cone.). From Shimomura et al., 1963b, with permission from John Wiley Sons Ltd. Fig. 4.1.5 The time course of aequorin luminescence measured with various concentrations of Ca2+. Calcium acetate solution (5 ml) was added to 10 pi of aequorin solution to give the final Ca2+ concentrations of 10 2 M (A), 10-4 M (B), 10-5 M (C), 10 6 M (D), and 10 7 M (E) at 25°C. The dashed line (F) represents the light emitted following the addition of deionized distilled water that had been redistilled in quartz. The concentration of EDTA derived from the aequorin sample was 10 7 M (final cone.). From Shimomura et al., 1963b, with permission from John Wiley Sons Ltd.
From this material, samples are cut and swelled to constant weight in a buffered saline solution prepared from 8.43 g sodium chloride (NaCl), 9.26 g boric acid (H3BO3), 1.0 g sodium borate (Na3B03), and 0.1 g of the disodium salt of the dihydrate of ethylenediaminetetraacetic acid [Na2 EDTA -(/ 0)21 ini L of distilled water. [Pg.251]

For the hybridization, samples with deposited DNA were placed in plastic envelopes containing 2 mL of the hybridization buffer (10 mM Tris-HCl, pH 7.6,1 mM EDTA, 0.5% SDS). Twenty mL of the boiled probe was added to the same envelope. The envelopes were then sealed and placed into the water thermostat at 60°C, with stirring overnight. After the hybridization, the samples were strongly washed with distilled water for 10 min, dried, and measured. Cold hybridization was performed at room temperature. [Pg.192]

EDTA solution, 10%. Weigh lOOg of EDTA into a 1-L volumetric flask, and dilute the solution to volume with distilled water... [Pg.1096]

Buffer and chemicals pH 7.8 phosphate buffer (16.29g Na2HP04-2H20, 1.17g NaH2P04H20, 1000 ml distilled water), Ethylene Diamine Tetra Acetic Acid (EDTA), Methionine (Met), Polyvinylpyrrolidone (PVP), Triton X-100, Phenylmethylsulphonylfluoride (PMSF), Riboflavin, Nitro Blue Tetrazolium (NBT). [Pg.169]

The flask was equipped with two addition funnels one of them was filled with the solution of oxone (1 g) in aqueous Na2(EDTA) (4 x 10-4 M, 6.5 mL) and the other one with a solution of potassium carbonate (930 mg) in distilled water (6.5 mL). The two solutions were added dropwise as slowly as possible over a period of 1 hour. [Pg.96]

Ni(cod)2 (1.59g, 6.00mmol), 1,5-cyclooctadiene (531 mg, 5.00mmol), and 2,2 -bipyridyl (937 mg, 6.00 mmol) were dissolved in DMF (20 ml), in a Schlenk tube under argon. To the solution was added 2,5-dibromothiophene (1.21 g, 5.00 mmol) at room temperature. The reaction mixture was stirred at 60°C for 16 h to yield a reddish-brown precipitate. The reaction mixture was then poured into HCl-acidic methanol, and the precipitate of PT was separated by filtration. The precipitate was washed with HCl-acidic methanol, ethanol, hot toluene, a hot aqueous solution of EDTA (pH = 3.80), a hot aqueous solution of EDTA (pH = 9), and distilled water in this order and dried under vacuum to yield a reddish-brown powder of PT. [Pg.256]

List of Abbreviations cDNA, complementary DNA ddH20, double-distilled H2O dNTP, deoxyribonu-cleotide triphosphate EDTA, ethylenediaminetetraacetic acid MgCl2, magnesium chloride mRNA, messenger ribonucleic acid NaOH, sodium hydroxide PCR, polymerase chain reaction qRT PCR, quantitative reverse transcriptase polymerase chain reaction RNase, ribonuclease RT PCR, reverse transcriptase polymerase chain reaction UTR, untranslated region... [Pg.372]

Other sulfonamides. The fact that the extraction of one of these sulfonamides is only optimized at a totally different pH displays the compilations in relying on a single set of extraction conditions as representative for all members within each class of PPCPs. To trap acid components in the sample, the sample has to be acidified to pH < 2, passed through a conditioned column such as an RP C18 solid-phase extraction column, and then eluted with a volatile solvent. Neutral compounds are, on the other hand, extracted by adjusting the sample to pH 7-8 before ranning the sample through the extraction column, which has been conditioned with acetone, methanol, or distilled water. Basic compounds are extracted by initially adjusting the sample to pH > 12 with EDTA and KOH. [Pg.86]

Example. In the titration of 50 ml of water being studied (plus 50 ml of distilled water), 12.55 ml of an EDTA solution with a normality of 0.0203 were used. Hence, the total content of calcium and magnesium ions will be... [Pg.199]

EDTA Solution. Prepare a 0.02 TV EDTA solution by dissolving 3.75 g of EDTA (complexon) in distilled water in a one-litre measuring flask and then bring the volume up to the mark on the flask. [Pg.200]

Determining the Normality of the EDTA Solution. Transfer 15 ml of the 0.02 TV standard calcium and magnesium solution with a pipette into a 200-ml conical flask, and add 85 ml of distilled water and 5 ml of a buffer solution. Stir the liquid and add 4-7 drops of an indicator solution, after which titrate it with EDTA in the same way as when determining calcium and magnesium. Calculate the normality TV of the EDTA solution by the formula... [Pg.200]


See other pages where EDTA distillation is mentioned: [Pg.98]    [Pg.98]    [Pg.154]    [Pg.113]    [Pg.176]    [Pg.183]    [Pg.321]    [Pg.266]    [Pg.177]    [Pg.402]    [Pg.10]    [Pg.268]    [Pg.54]    [Pg.72]    [Pg.483]    [Pg.49]    [Pg.27]    [Pg.139]    [Pg.670]    [Pg.120]    [Pg.367]    [Pg.68]    [Pg.54]    [Pg.356]    [Pg.621]    [Pg.199]   
See also in sourсe #XX -- [ Pg.98 ]




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